91442279 has 4 divisors (see below), whose sum is σ = 91462776. Its totient is φ = 91421784.

The previous prime is 91442261. The next prime is 91442287. The reversal of 91442279 is 97224419.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91442279 - 2⁸ = 91442023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91441279) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404 + ... + 13529.

It is an arithmetic number, because the mean of its divisors is an integer number (22865694).

Almost surely, 2^91442279 is an apocalyptic number.

91442279 is a deficient number, since it is larger than the sum of its proper divisors (20497).

91442279 is a wasteful number, since it uses less digits than its factorization.

91442279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20496.

The product of its digits is 36288, while the sum is 38.

The square root of 91442279 is about 9562.5456338780. The cubic root of 91442279 is about 450.5216649822.

The spelling of 91442279 in words is "ninety-one million, four hundred forty-two thousand, two hundred seventy-nine".